Photoelectric incident light distance measuring device

Details Photoelectric incident light distance measuring device Photoelectric incident light distance measuring device

1977-11-23

1979-11-27

Segal, Robert

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356356, 356395, H01J 314

Patent

active

041762762

ABSTRACT:
Disclosed is a photoelectric incident light distance measuring device, comprising a light source; a reflecting scale grating; a reference grating with a lattice constant differing from that of the scale grating; the reference grating being transparent and displaceable with respect to the scale grating; an air space between the two gratings; and a plurality of photoelectric receivers placed at intervals in the direction of the distance to be measured for scanning the scale grating through the reference grating whereby vernier strips are produced, and wherein at least two of the photoelectric receivers are arranged approximately at a distance "x", measured in the direction of the light, from the grating with the larger optically effective lattice constant, wherein:

REFERENCES:
patent: 3344700 (1967-10-01), Brake
patent: 3351768 (1967-11-01), Cooke
patent: 4049965 (1977-09-01), Pettigrew
patent: 4051367 (1977-09-01), Sayce et al.
patent: 4079252 (1978-03-01), Brake

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